CN109155934B - Communication device, wireless communication system, and wireless communication method - Google Patents

Communication device, wireless communication system, and wireless communication method Download PDF

Info

Publication number
CN109155934B
CN109155934B CN201680085501.1A CN201680085501A CN109155934B CN 109155934 B CN109155934 B CN 109155934B CN 201680085501 A CN201680085501 A CN 201680085501A CN 109155934 B CN109155934 B CN 109155934B
Authority
CN
China
Prior art keywords
communication device
retransmission control
signal
communication
control
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201680085501.1A
Other languages
Chinese (zh)
Other versions
CN109155934A (en
Inventor
太田好明
河崎义博
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Publication of CN109155934A publication Critical patent/CN109155934A/en
Application granted granted Critical
Publication of CN109155934B publication Critical patent/CN109155934B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1809—Selective-repeat protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1825—Adaptation of specific ARQ protocol parameters according to transmission conditions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H04L1/1816—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of the same, encoded, message
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1874—Buffer management
    • H04L1/1877—Buffer management for semi-reliable protocols, e.g. for less sensitive applications like streaming video
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1887—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/189—Transmission or retransmission of more than one copy of a message
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1896—ARQ related signaling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/04—Error control

Abstract

A communication device is provided with: a wireless processing unit that transmits or receives a wireless signal; and a control unit that controls the application of retransmission control based on information indicating whether or not retransmission control is applied, which is included in a radio signal received from another communication apparatus via the radio processing unit.

Description

Communication device, wireless communication system, and wireless communication method
Technical Field
The present invention relates to a communication apparatus, a wireless communication system, and a wireless communication method for performing wireless communication, for example.
Background
In a wireless communication system such as a mobile communication system, the amount of data communicated in the wireless communication system is increasing with an increase in the number of communication terminals connected, an increase in the quality of data to be transmitted, a diversification of services to be provided, and the like. In order to increase the communication capacity of a wireless communication system, various techniques have been developed and standardized as a specification of the wireless communication system (for example, see non-patent documents 1 to 11).
Prior art documents
Non-patent document
Non-patent document 1: 3GPP TS36.300 v13.3.0, 2016 month 3
Non-patent document 2: 3GPP TS36.211 v13.1.0, 2016 month 3
Non-patent document 3: 3GPP TS36.212 v13.1.0, 2016 month 3
Non-patent document 4: 3GPP TS36.213 v13.1.1, 2016 month 3
Non-patent document 5: 3GPP TS36.321 v13.1.0, 2016 month 3
Non-patent document 6: 3GPP TS36.322 v13.1.0, 2016 month 3
Non-patent document 7: 3GPP TS36.323 v13.1.0, 2016 month 3
Non-patent document 8: 3GPP TS36.331 v13.1.0, 2016 month 3
Non-patent document 9: 3GPP TS36.413 v13.2.0, 2016 for 3 months
Non-patent document 10: 3GPP TS36.423 v13.3.0, 2016 month 3
Non-patent document 11: 3GPP TS36.881 v0.6.0, 2016 month 2
Disclosure of Invention
Problems to be solved by the invention
However, there is an ever increasing likelihood of the amount of data being communicated over a wireless communication system. Accordingly, it is desirable to improve the communication efficiency of a wireless communication system.
An object of one aspect of the present invention is to provide a communication apparatus capable of improving communication efficiency of a wireless communication network.
Means for solving the problems
One embodiment of the present invention provides a communication device. The communication device has: a wireless processing unit that transmits or receives a wireless signal; and a control unit that controls the application of retransmission control based on information indicating whether or not retransmission control is applied, which is included in a radio signal received from another communication apparatus via the radio processing unit.
Another embodiment of the present invention provides a wireless communication system having a 1 st communication device and a 2 nd communication device. In this wireless communication system, the 1 st communication apparatus transmits a wireless signal including information indicating whether or not retransmission control is applied to the 2 nd communication apparatus, and the 2 nd communication apparatus controls application of retransmission control based on the information.
Another embodiment of the present invention provides a wireless communication method in a wireless communication system including a 1 st communication device and a 2 nd communication device. In the wireless communication method, the 1 st communication device transmits a wireless signal including information indicating whether or not retransmission control is applied to the 2 nd communication device, and the 2 nd communication device controls application of retransmission control based on the information.
Another embodiment of the present invention provides a communication device. The communication device has: a wireless processing unit that transmits or receives a wireless signal; and a control unit that determines whether or not to apply retransmission control based on at least any one of a communication state of wireless communication with another communication apparatus, a communication amount, and a type of data transmitted between the communication apparatus and the other communication apparatus, generates a wireless signal including information indicating whether or not to apply retransmission control based on a result of the determination, and transmits the wireless signal to the other communication apparatus via the wireless processing unit.
Effects of the invention
The communication apparatus disclosed in the present specification can improve the communication efficiency of a wireless communication system.
Drawings
Fig. 1 is a schematic configuration diagram of a wireless communication system according to embodiment 1.
Fig. 2 is an operation sequence diagram of a communication process related to retransmission control.
Fig. 3 is a schematic configuration diagram of one communication apparatus included in the wireless communication system according to embodiment 1.
Fig. 4 is a functional block diagram of a control unit of one communication apparatus associated with retransmission control.
Fig. 5 is a flowchart of the operation of a communication apparatus related to retransmission control.
Fig. 6 is a schematic configuration diagram of another communication apparatus included in the wireless communication system according to embodiment 1.
Fig. 7 is an operation flowchart of another communication apparatus relating to retransmission control.
Fig. 8 is a schematic configuration diagram of the wireless communication system according to embodiment 2.
Fig. 9 is a schematic configuration diagram of a base station.
Fig. 10 is a schematic configuration diagram of a mobile station.
Fig. 11(a) is a diagram showing an example of a structure of data transmitted by an uplink signal when retransmission control is applied, and fig. 11(B) is a diagram showing an example of a structure of data transmitted by an uplink signal when retransmission control is not applied. Fig. 11(C) is a diagram showing another example of the structure of data transmitted by an uplink signal.
Detailed Description
Hereinafter, a communication apparatus, a wireless communication system, and a communication method will be described with reference to the drawings.
Hybrid automatic repeat request (HARQ) is adopted in a so-called Long Term Evolution (LTE) technology, a Worldwide Interoperability for Microwave Access (WiMAX), or the like, which is one of the standard specifications of mobile communication. HARQ is a technique related to retransmission control in which a transmitting-side communication apparatus retransmits data when the data cannot be correctly reproduced by a receiving-side communication apparatus, and combines a preceding error correction symbol with an automatic retransmission request. In HARQ, a communication apparatus on the receiving side, for example, a base station, transmits an Ack signal or a Nack signal in order to notify the communication apparatus on the transmitting side of whether or not data received from the communication apparatus on the transmitting side, for example, a mobile station, cannot be normally reproduced. Then, the communication apparatus on the transmitting side that has received the Nack signal divides the data into parts and retransmits the data. Thus, data that could not be normally reproduced until then can be normally reproduced by the communication device on the receiving side.
However, depending on the type of data, there are both Traffic that can allow a certain transmission error and Traffic that has Low tolerance for delay (Low Latency Communication Traffic, LLC Traffic). LLC Traffic may give priority to suppression of delay rather than transmission error, in which case retransmission control may not be performed.
In addition, with respect to the Uplink, a Contention based Physical Uplink Shared Channel (CB-PUSCH) is being studied. Also, transmission of data of LLC Traffic using CB-PUSCH is being studied. In this case, if HARQ is used, although retransmission control is not necessary, communication efficiency of wireless communication is lowered because Ack signal or Nack signal transmission is performed.
Thus, according to the present embodiment, one communication apparatus determines whether or not retransmission control is applied, for example, based on at least any one of the communication state, the communication amount, or the type of data transmitted, and notifies the other communication apparatus of whether or not the retransmission control is applied. The other communication apparatus controls the application of retransmission control in accordance with the notification. When retransmission control is applied, the other communication apparatus assigns an error detection code associated with the retransmission control to the transmitted signal, and when retransmission control is not applied, does not assign the error detection code to the transmitted signal. Thus, the communication device and the wireless communication system including the communication device can improve the communication efficiency.
In this specification, a base station and a mobile station are examples of a communication apparatus. Node bs, eNode bs, new eNode bs, access points, and the like are examples of base stations. In addition, a mobile terminal or User Equipment (UE) is an example of a mobile station. In the present specification, HARQ, Automatic repeat-request (arq), and the like are examples of retransmission control. The error detection code associated with retransmission control is an error detection code used when the receiving-side communication device determines whether or not to make a retransmission request based on whether or not the received data is reproduced normally. In addition, the error detection code also includes an error correction flag.
Fig. 1 is a schematic configuration diagram of a wireless communication system according to embodiment 1. The wireless communication system 1 includes a communication apparatus 11 and a communication apparatus 12. And the communication means 11 and the communication means 12 transmit signals by wireless communication with each other. One or both of the communication device 11 and the communication device 12 may be mobile terminals, or may be fixed communication devices.
The communication device 11 determines whether or not to apply retransmission control in a predetermined cycle or at a predetermined timing, based on the communication state or the communication amount of wireless communication between the communication device 11 and the communication device 12 or the type of data transmitted between the communication device 11 and the communication device 12.
Each time it is determined whether or not retransmission control is applicable, the communication device 11 generates a control signal containing information indicating whether or not the application is applicable, and transmits the control signal to the communication device 12. In addition, the communication device 11 controls the application of retransmission control in wireless communication with the communication device 12 based on the result of determination as to whether or not the application is available. That is, when the retransmission control is not applied, the communication apparatus 11 does not transmit a response signal such as Ack/Nack to the communication apparatus 12 regardless of whether or not data included in the wireless signal received from the communication apparatus 12 is normally reproduced.
On the other hand, when retransmission control is applied, the communication apparatus 11 performs error detection processing corresponding to an error detection code given to a radio signal in accordance with the application of retransmission control, and determines whether or not data included in the radio signal is reproduced normally. The communication device 11 transmits a different response signal to the communication device 12 depending on whether or not data included in the wireless signal received from the communication device 12 is normally reproduced, for example. For example, when data included in a wireless signal received from the communication device 12 is normally reproduced, the communication device 11 transmits an Ack signal to the communication device 12. On the other hand, when data included in the wireless signal received from the communication device 12 is not normally reproduced, the communication device 11 transmits a Nack signal to the communication device 12. As the error detection code, for example, a Cyclic Redundancy Check (CRC) code is used.
On the other hand, each time the communication apparatus 12 receives a control signal including information indicating whether or not retransmission control is available from the communication apparatus 11, the communication apparatus refers to the information and controls application of retransmission control. That is, if the received control signal includes information indicating that retransmission control is not to be applied, the communication apparatus 12 does not apply retransmission control. In this case, the communication device 12 does not apply the error detection code associated with retransmission control to the radio signal transmitted to the communication device 11. In this case, since the communication device 12 does not need to store the data included in the radio signal transmitted to the communication device 11 in the storage unit of the communication device 12 in order to retransmit the data, the data included in the radio signal can be discarded after the transmission of the radio signal.
On the other hand, if the received control signal includes information indicating that retransmission control is to be applied, the communication apparatus 12 applies retransmission control. In this case, the communication device 12 assigns an error detection code associated with retransmission control to the radio signal transmitted to the communication device 11. Before confirming that the transmitted data is reproduced normally on the communication apparatus 11 side or before a certain period of time has elapsed, the communication apparatus 12 stores data included in the radio signal transmitted to the communication apparatus 11 in the storage unit of the communication apparatus 12 for retransmission. When receiving a signal requesting retransmission (for example, a Nack signal) from the communication apparatus 11, the communication apparatus 12 retransmits a radio signal including a part or all of data corresponding to the signal.
Fig. 2 is an operation sequence diagram of a communication process related to retransmission control according to the present embodiment.
The communication device 11 determines whether or not retransmission control is applicable, based on any one of the communication state, the communication amount, or the type of data transmitted, which are related to the wireless communication between the communication devices 12 (step S101). Then, the communication device 11 generates a control signal including information indicating whether or not the retransmission control is applicable, and transmits the control signal to the communication device 12 (step S102).
On the other hand, upon receiving the control signal, the communication device 12 controls the application of retransmission control based on information indicating whether or not retransmission control can be applied, which is included in the control signal (step S103). Then, the communication apparatus 11 and the communication apparatus 12 perform wireless communication according to the control result of the application of the retransmission control (step S104).
Fig. 3 is a schematic configuration diagram of the communication device 11. The communication device 11 includes an antenna 21, a wireless processing unit 22, a storage unit 23, and a control unit 24. The wireless processing unit 22, the storage unit 23, and the control unit 24 are formed as separate circuits. Alternatively, these units may be mounted on the communication device 11 as one or more integrated circuits integrated with the corresponding units.
The antenna 21 transmits the transmission signal transmitted by the wireless processing unit 22 as a wireless signal. The antenna 21 receives a radio signal from the communication device 12, converts the radio signal into an electric signal as a reception signal, and transmits the reception signal to the radio processing unit 22. The antenna 21 may be provided with a transmission antenna and a reception antenna, respectively.
The radio processing unit 22 simulates the transmission signal received from the control unit 24, and then superimposes the transmission signal on a carrier wave having a radio frequency specified by the control unit 24. The radio processing unit 22 amplifies the transmission signal superimposed on the carrier wave to a desired level by a radio frequency amplifier (not shown), and transmits the transmission signal to the antenna 21.
The radio processing unit 22 amplifies the received signal received from the antenna 21 by a low noise amplifier (not shown). The radio processing unit 22 multiplies the amplified reception signal by a periodic signal having an intermediate frequency, thereby converting the frequency of the reception signal from a radio frequency to a baseband frequency. The radio processing unit 22 performs analog-to-digital conversion on the received signal having the baseband frequency, and then transfers the converted signal to the control unit 24.
The storage unit 23 includes, for example, a rewritable nonvolatile semiconductor memory or a volatile semiconductor memory. The storage unit 23 stores various information for communicating with the communication device 12, various information transmitted or received by the communication device 11, various programs operated by the communication device 11, and the like. The storage unit 23 stores various information for determining whether or not retransmission control is applicable.
The control unit 24 includes, for example, 1 or more processors and peripheral circuits thereof. The control unit 24 modulates and multiplexes the transmission signal in accordance with a predetermined modulation scheme. Then, the control unit 24 transfers the modulated and multiplexed transmission signal to the radio processing unit 22.
On the other hand, the control unit 24 separates the received signals received from the radio processing unit 22 in accordance with a predetermined multiplexing scheme, and demodulates the separated received signals. The control unit 24 removes various kinds of control information and data included in the demodulated received signal. Then, the control unit 24 executes processing corresponding to the extracted control information or data.
The control unit 24 executes various processes for executing wireless communication, such as transmission power control and call control.
The control unit 24 executes various processes for determining whether or not retransmission control is applicable.
Fig. 4 is a functional block diagram of the control unit 24 related to retransmission control. The control unit 24 includes a retransmission control unit 241, a notification unit 242, and a retransmission control execution unit 243. These respective units included in the control unit 24 are realized by a computer program that operates on a processor included in the control unit 24. Alternatively, each of these units included in the control unit 24 may be mounted on the communication device 11 as one or more integrated circuits that integrate circuits that realize the functions of the units, independently of the processor included in the control unit 24.
The retransmission control section 241 determines whether or not retransmission control is applicable, based on the communication state or the communication amount of wireless communication between the communication apparatus 11 and the communication apparatus 12, or the type of data transmitted between the communication apparatus 11 and the communication apparatus 12.
For example, the retransmission control unit 241 may determine not to apply retransmission control when the value of the parameter indicating the radio quality of the radio signal received from the communication device 12 satisfies a predetermined quality reference. On the other hand, the retransmission control unit 241 may determine to apply retransmission control when the value of the parameter indicating the radio quality does not satisfy the predetermined quality reference.
Alternatively, the retransmission control section 241 may determine not to apply retransmission control when the amount of data transmitted a certain time is equal to or less than a predetermined threshold, and determine to apply retransmission control when the amount of data transmitted a certain time is greater than a predetermined threshold. Alternatively, the retransmission control unit 241 may determine not to apply retransmission control when the relative moving speed of the communication apparatus 12 with respect to the communication apparatus 11 is equal to or less than a predetermined threshold value, and determine to apply retransmission control when the relative moving speed is greater than the predetermined threshold value. Alternatively, when the communication apparatus 11 can set a plurality of communication possible ranges, and when the communication apparatus 12 moves from any one of the communication possible ranges to another communication possible range within the latest predetermined period, the retransmission control section 241 may determine to apply the retransmission control. On the other hand, when the communication apparatus 12 stays within any communication possible range within the latest predetermined period, the communication apparatus 11 may determine not to apply the retransmission control.
Further, the retransmission control unit 241 may determine that retransmission control is not to be applied when the data transmitted from the communication apparatus 12 to the communication apparatus 11 is LLC Traffic data such as streaming data or data of an audio call. The retransmission control unit 241 may determine not to apply retransmission control when data transmitted from the communication device 12 to the communication device 11 is data transmitted at a fixed cycle, such as data of the Internet of Things (IoT). On the other hand, when the data transmitted from the communication apparatus 12 to the communication apparatus 11 is data that requires normal reproduction in the communication apparatus 11 or an apparatus that transfers the data via the communication apparatus 11, the retransmission control section 241 may determine to apply retransmission control.
Further, the retransmission control section 241 may determine whether or not to apply retransmission control based on a combination of at least two or more of a communication state, a traffic volume, and a data type, for example. For example, the retransmission control unit 241 may determine that the retransmission control is to be applied when any one of the above examples of the parameters satisfies the condition for applying the retransmission control, and determine that the retransmission control is not to be applied when the other conditions are satisfied.
The retransmission control section 241 notifies the notification section 242 and the retransmission control execution section 243 of information indicating whether or not retransmission control is applicable.
The notification unit 242 generates a control signal including information indicating whether or not retransmission control is applicable, each time the retransmission control unit 241 determines whether or not retransmission control is applicable. The control signal is an example of a transmission signal transmitted from the communication device 11 to the communication device 12. The notification unit 242 then transmits the control signal to the communication device 12 via the wireless processing unit 22 and the antenna 21.
The retransmission control execution unit 243 executes retransmission control.
Fig. 5 is a flowchart showing the operation of the communication apparatus 11 related to retransmission control executed by the retransmission control execution unit 243.
The retransmission control execution unit 243 determines whether or not to apply retransmission control based on the information indicating whether or not to apply retransmission control notified from the retransmission control unit 241 (step S201). When the retransmission control is applied (step S201-Yes), the retransmission control execution unit 243 executes error detection processing corresponding to the error detection code assigned to the data included in the received signal from the communication device 12, in accordance with the application of the retransmission control. Then, the retransmission control execution unit 243 determines whether or not the data is normally reproduced (step S202). The retransmission control execution unit 243 generates a different response signal depending on whether or not the data included in the received signal is normally reproduced, for example. For example, when the data included in the received signal is normally reproduced (step S202-Yes), the retransmission control execution unit 243 generates an Ack signal and transmits the Ack signal to the communication device 12 via the wireless processing unit 22 and the antenna 21 (step S203).
On the other hand, when the data included in the received signal is not reproduced normally (No in step S202), the retransmission control execution unit 243 generates a Nack signal and transmits the Nack signal to the communication device 12 via the radio processing unit 22 and the antenna 21 (step S204). The Nack signal is an example of a retransmission request signal for requesting the communication device 12 to retransmit data. Then, the retransmission control execution unit 243 reproduces the data included in the original received signal using the retransmitted data in accordance with the retransmission control adopted in the wireless communication system 1 (step S205). The retransmission control execution unit 243 may repeat the processing from step S202 as necessary.
On the other hand, when the retransmission control is not applied in step S201 (step S201-No), the retransmission control execution unit 243 does not execute the retransmission control. Therefore, even if the data included in the reception signal received from the communication device 12 is normally reproduced, the retransmission control execution unit 243 does not generate a response signal such as Ack/Nack.
Fig. 6 is a schematic configuration diagram of the communication device 12. The communication device 12 includes an antenna 31, a wireless processing unit 32, a storage unit 33, and a control unit 34. The wireless processing unit 32, the storage unit 33, and the control unit 34 are formed as separate circuits. Alternatively, these units may be mounted on the communication device 12 as one or more integrated circuits in which circuits corresponding to the units are integrated.
The antenna 31 transmits the transmission signal transmitted by the wireless processing unit 32 as a wireless signal. The antenna 31 receives a radio signal from the communication device 11, converts the radio signal into an electric signal as a reception signal, and transmits the reception signal to the radio processing unit 32. The antenna 31 may have a transmission antenna and a reception antenna.
The radio processing unit 32 simulates the transmission signal received from the control unit 34, and then superimposes the transmission signal on a carrier wave having a radio frequency specified by the control unit 34. The radio processing unit 32 amplifies the transmission signal superimposed on the carrier wave to a desired level by a radio frequency amplifier (not shown), and transmits the transmission signal to the antenna 31.
The radio processing unit 32 amplifies the received signal received from the antenna 31 by a low noise amplifier (not shown). The radio processing unit 32 multiplies the amplified reception signal by a periodic signal having an intermediate frequency, thereby converting the frequency of the reception signal from a radio frequency to a baseband frequency. The radio processing unit 32 performs analog-to-digital conversion on the received signal having the baseband frequency, and then transfers the converted signal to the control unit 34.
The storage unit 33 includes, for example, a rewritable nonvolatile semiconductor memory or a volatile semiconductor memory. The storage unit 33 stores various information for communicating with the communication device 11, various information transmitted or received by the communication device 12, various programs operated by the communication device 12, and the like. The storage unit 33 stores various information used for performing retransmission control. When the retransmission control is applied, the storage unit 33 stores the transmission signal that was transmitted for a certain period of time.
The control unit 34 includes, for example, 1 or more processors and peripheral circuits thereof. The control unit 34 modulates and multiplexes the transmission signal according to a predetermined modulation scheme. Then, the control unit 34 transfers the modulated and multiplexed transmission signal to the radio processing unit 32.
On the other hand, the control unit 34 separates the received signals received from the radio processing unit 32 according to a predetermined multiplexing scheme, and demodulates the separated received signals. The control unit 34 extracts various kinds of control information and data included in the demodulated received signal. Then, the control unit 34 executes processing corresponding to the extracted control information or data.
The control unit 34 executes various processes for executing wireless communication, such as transmission power control and call control.
Further, each time a control signal including information indicating whether or not retransmission control is applicable is received from the communication device 11, the control unit 34 controls the application of retransmission control with reference to the information.
Fig. 7 is a flowchart showing the operation of the communication apparatus 12 related to retransmission control executed by the control unit 34.
The control unit 34 determines whether or not the received control signal includes information indicating that retransmission control is to be applied (step S301).
If information indicating that retransmission control is to be applied is included in the received control signal (step S301-Yes), the control section 34 applies retransmission control. In this case, the control unit 34 adds an error detection code associated with retransmission control to data included in a transmission signal transmitted to the communication device 11, and generates the transmission signal (step S302). Then, the control unit 34 transmits the transmission signal to the communication device 11 through the wireless processing unit 32 and the antenna 31.
Before the communication device 11 confirms that the transmitted data is normally reproduced or before a predetermined period of time elapses, the control unit 34 stores data included in the transmission signal transmitted to the communication device 11 in the storage unit 33 and retransmits the data (step S303). When receiving a signal requesting retransmission (for example, a Nack signal) from the communication device 11, the control unit 34 generates a retransmission transmission signal including a part or all of the data included in the transmission signal. The control unit 34 transmits the generated transmission signal to the communication device 11 through the wireless processing unit 32 and the antenna 31 (step S304).
On the other hand, in step S301, if information indicating that retransmission control is not to be applied is included in the received control signal (step S301-No), the control section 34 does not apply retransmission control. In this case, the control unit 34 generates the transmission signal without applying the error detection code associated with retransmission control to the data included in the transmission signal transmitted to the communication device 11 (step S305). Then, the control unit 34 transmits the transmission signal to the communication device 11 through the wireless processing unit 32 and the antenna 31. In this case, the control unit 34 may discard the data included in the transmission signal transmitted to the communication device 11 without storing the data in the storage unit 33.
As described above, in this wireless communication system, one communication apparatus determines whether or not retransmission control is applicable, and notifies the other communication apparatus of the applicability of the control. And, the other communication apparatus controls the application of retransmission control in accordance with the notification. Therefore, the wireless communication system can dynamically switch whether or not to apply retransmission control, and thus can suppress a decrease in communication efficiency that accompanies retransmission control without applying retransmission control. As a result, the wireless communication system and each communication device included in the wireless communication system can improve communication efficiency.
Next, a radio communication system according to embodiment 2 will be described. The wireless communication system has a base station and a mobile station. The base station determines whether or not to apply retransmission control based on the communication state or the amount of communication in wireless communication with the mobile station, and transmits a control signal including information indicating whether or not to apply the retransmission control to the mobile station. The mobile station controls the application of retransmission control based on this information.
Fig. 8 is a schematic configuration diagram of the wireless communication system according to embodiment 2. The wireless communication system 2 according to embodiment 2 includes a base station 41 and a mobile station 42. The base station 41 and the mobile station 42 are examples of communication devices. The number of base stations included in the wireless communication system 2 is not limited to 1, and may be a plurality of base stations. Similarly, the number of mobile stations included in the wireless communication system 2 is not limited to 1, and may be a plurality of mobile stations.
The base station 41 and the mobile station 42 execute communication processing related to retransmission control in accordance with the operation command shown in fig. 2. In the present embodiment, the communication apparatus 11 in fig. 2 may be the base station 41, and the communication apparatus 12 may be the mobile station 42, and may execute the communication processing related to the retransmission control.
That is, the base station 41 determines whether or not to apply the retransmission control based on the communication state or the communication amount of the wireless communication between the base station 41 and the mobile station 42 at a fixed cycle or at a predetermined timing, as in the communication apparatus 11 of embodiment 1. The predetermined timing may be, for example, at the time of handover or at the time of connection request.
Each time the base station 41 determines whether or not retransmission control is applicable, it generates a control signal containing information indicating whether or not the application is applicable, and transmits the control signal to the mobile station 42. In addition, the base station 41 controls the application of retransmission control in wireless communication with the mobile station 42 based on the result of determination as to whether or not the application is possible. That is, when the retransmission control is not applied, the base station 41 does not transmit a response signal such as Ack/Nack to the communication device 12 even if data included in the uplink signal received from the mobile station 42 is normally reproduced.
On the other hand, when retransmission control is applied, the base station 41 determines whether or not data included in a radio signal is reproduced normally by performing error detection processing corresponding to an error detection code assigned to the radio signal on the radio signal in accordance with the application of retransmission control. The base station 41 transmits a different response signal to the mobile station 42, for example, depending on whether or not data included in the uplink signal received from the mobile station 42 is normally reproduced.
On the other hand, the mobile station 42 controls the application of retransmission control by referring to downlink control signals including information indicating whether or not retransmission control is applicable, each time the downlink control signals are received from the base station 41, as in the communication apparatus 12 in embodiment 1. That is, if the received control signal includes information indicating that retransmission control is not to be applied, the mobile station 42 does not apply retransmission control. In this case, the mobile station 42 does not apply the error detection code associated with retransmission control to the data included in the uplink signal transmitted to the base station 41. In this case, since data included in the uplink signal transmitted to the base station 41 is not retransmitted, the mobile station 42 discards the data included in the transmitted uplink signal without storing the data in the storage unit.
On the other hand, if the received control signal includes information indicating that retransmission control is to be applied, the mobile station 42 applies retransmission control. In this case, the mobile station 42 assigns an error detection code associated with retransmission control to the uplink signal transmitted to the base station 41. The mobile station 42 stores data included in the uplink signal transmitted to the base station 41 in a storage unit and retransmits the data until the base station 41 confirms that the transmitted data is normally reproduced or until a predetermined period of time elapses. When receiving a signal requesting retransmission (for example, a Nack signal) from the base station 41, the mobile station 42 retransmits a part or all of the data corresponding to the signal.
In addition, when there are a plurality of mobile stations connected to the base station 41, the base station 41 can determine whether or not to apply retransmission control for each mobile station. The base station 41 may notify, for each mobile station, a control signal including information indicating whether or not retransmission control is applicable to the mobile station.
Fig. 9 is a schematic configuration diagram of the base station 41. The base station 41 includes an antenna 51, a wireless processing unit 52, a wired interface unit 53, a storage unit 54, and a control unit 55. The wireless processing unit 52, the storage unit 54, and the control unit 55 are formed as separate circuits. Alternatively, each of these units may be mounted on the base station 41 as one or more integrated circuits in which circuits corresponding to the unit are integrated.
The antenna 51 transmits the downlink signal transmitted by the radio processing unit 52 as a radio signal. The antenna 51 receives a radio signal from the mobile station 42, converts the radio signal into an electric signal as an uplink signal, and transmits the uplink signal to the radio processing unit 52. The antenna 51 may have a transmission antenna and a reception antenna, respectively.
The radio processing unit 52 simulates the downlink signal received from the control unit 55, and then superimposes the downlink signal on a carrier wave having a radio frequency specified by the control unit 55. The radio processing unit 52 amplifies the downlink signal superimposed on the carrier wave to a desired level by a radio frequency amplifier (not shown), and transmits the downlink signal to the antenna 51.
The radio processing unit 52 amplifies the uplink signal received from the antenna 51 by a low noise amplifier (not shown). The radio processing unit 52 multiplies the amplified uplink signal by a periodic signal having an intermediate frequency, thereby converting the frequency of the uplink signal from a radio frequency to a baseband frequency. The radio processing unit 52 performs analog-to-digital conversion on the uplink signal having the baseband frequency, and then transfers the converted signal to the control unit 55.
The wired interface 53 has a communication interface circuit for connecting the base station 41 to an upper node apparatus (not shown) and another base station. The wired interface unit 53 analyzes the signal received from the upper node apparatus according to the S1 interface, and extracts the downlink signal and the control signal included in the signal. The wired interface unit 53 analyzes a signal received from another base station according to the X2 interface, and extracts a control signal included in the signal. The wired interface 53 then transfers the extracted downlink signal and control signal to the control unit 55.
On the other hand, the wired interface 53 converts the uplink signal received from the control unit 55 into a signal conforming to the S1 interface and outputs the signal to the upper node apparatus. The wired interface 53 converts a control signal transmitted to another base station into a format conforming to the X2 interface. The wired interface 53 outputs the control signal to another base station.
The storage unit 54 includes, for example, a rewritable nonvolatile semiconductor memory or a volatile semiconductor memory. The storage unit 54 stores various information for communication with the mobile station 42, various information transmitted or received by the base station 41, various programs to be operated by the base station 41, and the like. The storage unit 54 stores various information used when determining whether or not to apply retransmission control.
The control unit 55 includes, for example, 1 or more processors and peripheral circuits thereof. The control unit 55 modulates and multiplexes the downlink signal in accordance with the modulation and multiplexing scheme adopted in the communication standard which the wireless communication system 2 conforms to. Then, the control unit 55 transfers the modulated and multiplexed downlink signal to the radio processing unit 52. For example, the control section 55 modulates and multiplexes a downlink signal in Orthogonal frequency-division multiple access (OFDMA).
On the other hand, the control unit 55 separates the uplink signal received from the radio processing unit 52 in accordance with the modulation and multiplexing scheme adopted in the communication standard which the radio communication system 2 conforms to, and demodulates the separated received signals. For example, the controller 55 separates and demodulates the uplink signal according to a Single-Carrier Frequency Division Multiple Access (SC-FDMA) or a multiplexing method according to another FDMA method. The control unit 55 then outputs the demodulated uplink signal to the wired interface unit 53. The control unit 55 extracts various signals referred to by the base station 41, for example, control information related to call control, parameters indicating a communication state and a communication amount from the mobile station 42, and the like from the demodulated uplink signal.
The control unit 55 executes various processes for executing wireless communication, such as transmission power control and call control. The control unit 55 executes various processes for determining whether or not retransmission control is applicable. Therefore, the control unit 55 includes a retransmission control unit 241, a notification unit 242, and a retransmission control execution unit 243 for retransmission control, as in the control unit 24 of the communication device 11 according to embodiment 1 shown in fig. 4.
The retransmission control section 241 determines whether or not retransmission control can be applied, for example, based on the communication state or the communication amount of wireless communication between the base station 41 and the mobile station 42. Further, for example, HARQ is adopted as retransmission control.
For example, the retransmission control unit 241 may determine not to apply retransmission control when the value of the parameter indicating the radio quality of the downlink signal or the uplink signal satisfies a predetermined quality reference. The parameter indicating the radio quality is an example of a parameter indicating a communication state of radio communication between the base station 41 and the mobile station 42. On the other hand, the retransmission control unit 241 may determine to apply retransmission control when the value of the parameter indicating the radio quality does not satisfy the predetermined quality reference. For example, a Channel Quality Indicator (CQI) is used as a parameter indicating radio Quality. In this case, the retransmission control section 241 compares the CQI included in the measurement report (measurement report) received by the base station 41 from the mobile station 42 with a predetermined threshold value. The retransmission control unit 241 may determine not to apply retransmission control when the CQI is equal to or greater than a predetermined threshold value, and may determine to apply retransmission control when the CQI is less than the predetermined threshold value.
Alternatively, the parameter indicating the radio quality may be a measurement value of a Sounding Reference Signal (SRS) transmitted from the mobile station 42. In this case, the retransmission control section 241 compares the measurement value with a threshold value. The retransmission control unit 241 may determine not to apply retransmission control when the measurement value is equal to or greater than a predetermined threshold value, and may determine to apply retransmission control when the measurement value is smaller than the predetermined threshold value.
Alternatively, the retransmission control unit 241 may determine not to apply the retransmission control when the relative moving speed of the mobile station 42 with respect to the base station 41 is equal to or less than a predetermined threshold value, and may determine to apply the retransmission control when the relative moving speed is greater than the predetermined threshold value. The relative moving speed of the mobile station 42 with respect to the base station 41 is another example of a parameter indicating the communication state of the radio communication between the base station 41 and the mobile station 42. In this case, the retransmission control section 241 may use the moving speed of the mobile station 42 notified from the mobile station 42 as a determination of whether or not the retransmission control is applicable, for example, by estimating the moving speed by measuring the doppler frequency. Alternatively, the retransmission control section 241 may calculate the moving speed of the mobile station 42 from the temporal change of the position information of the mobile station 42.
Alternatively, when the base station 41 is capable of setting a plurality of communication possible ranges, the retransmission control unit 241 may determine to apply the retransmission control when the mobile station 42 moves from any one of the communication possible ranges to another communication possible range within the latest predetermined period. On the other hand, when the mobile station 42 stays within any communication possible range within the latest predetermined period, the retransmission control section 241 may determine not to apply the retransmission control. Whether or not the mobile station 42 moves between the communication possible ranges is another example of the parameter indicating the communication state of the wireless communication between the base station 41 and the mobile station 42. Further, the communication possible range may be, for example, a cell or a beam.
Alternatively, the retransmission control unit 241 may determine not to apply retransmission control when the size of the Transport Block is equal to or smaller than a predetermined threshold value, and may determine to apply retransmission control when the size of the Transport Block is larger than the predetermined threshold value. The size of the Transport Block is an example of a parameter indicating traffic volume.
Further, the retransmission control section 241 may determine whether or not retransmission control is applicable, for example, based on a combination of communication states and communication amounts. For example, the retransmission control unit 241 determines that the retransmission control is to be applied when any of the above-described parameter examples satisfies the condition for applying the retransmission control, and determines that the retransmission control is not to be applied when the other parameter examples satisfy the condition.
The retransmission control section 241 notifies the notification section 242 and the retransmission control execution section 243 of information indicating whether or not retransmission control is applicable.
The notification unit 242 generates a control signal including information indicating whether or not retransmission control is applicable, every time the retransmission control unit 241 determines whether or not retransmission control is applicable, or every time a certain period elapses. The notification unit 242 then transmits the control signal to the mobile station 42 via the radio processing unit 52 and the antenna 51. The notification unit 242 may use the Control signal as a signal transmitted through a Physical Downlink Control CHannel (PDCCH). Alternatively, the notification unit 242 may use the Control signal as a signal of a MAC Control element (MAC CE) or a signal of Radio Resource Control (RRC).
The retransmission control execution unit 243 executes retransmission control in accordance with, for example, an operation flowchart shown in fig. 5, as in the communication apparatus 11 according to embodiment 1. That is, when the retransmission control is applied, the retransmission control execution unit 243 executes the error detection processing corresponding to the error detection code assigned to the uplink signal on the uplink signal in accordance with the application of the retransmission control employed in the wireless communication system 2. In this way, the retransmission control execution unit 243 determines whether or not the data included in the uplink signal is normally reproduced. For example, the retransmission control execution unit 243 determines whether or not a transport block included in the uplink signal is normally reproduced, based on a CRC symbol assigned to the transport block. Then, for example, when the data included in the uplink signal is normally reproduced, the retransmission control execution unit 243 generates an Ack signal and transmits the Ack signal to the mobile station 42 via the radio processing unit 52 and the antenna 51. On the other hand, when the data included in the uplink signal is not normally reproduced, the retransmission control execution unit 243 generates a Nack signal and transmits the Nack signal to the mobile station 42 via the radio processing unit 52 and the antenna 51. The retransmission control execution unit 243 regenerates the data included in the original uplink signal using the data retransmitted from the mobile station 42.
On the other hand, when the retransmission control is not applied, the retransmission control execution unit 243 does not generate a response signal such as Ack/Nack regardless of whether or not data included in the radio signal received from the mobile station 42 is normally reproduced.
Fig. 10 is a schematic configuration diagram of the mobile station 42. The mobile station 42 includes an antenna 61, a wireless processing unit 62, a storage unit 63, and a control unit 64. The mobile station 42 may have one or more of a user interface (not shown) such as a touch panel, a microphone (not shown), a speaker (not shown), and a camera (not shown). The mobile station 42 may also have a Global Positioning System (GPS) receiver (not shown) for measuring the position of the mobile station 42. The wireless processing unit 62, the storage unit 63, and the control unit 64 are formed as separate circuits. Alternatively, these units may be mounted on the mobile station 42 as one or more integrated circuits in which circuits corresponding to the units are integrated.
The antenna 61 transmits the uplink signal transmitted by the radio processing unit 62 as a radio signal. The antenna 61 receives a radio signal from the base station 41, converts the radio signal into an electrical signal as a downlink signal, and transmits the downlink signal to the radio processing unit 62. The antenna 61 may have a transmission antenna and a reception antenna, respectively.
The radio processing unit 62 simulates the uplink signal received from the control unit 64, and superimposes the simulation on a carrier wave having a radio frequency specified by the control unit 64. The radio processing unit 62 amplifies the uplink signal superimposed on the carrier wave to a desired level by a radio frequency amplifier (not shown), and transmits the uplink signal to the antenna 61.
The radio processing unit 62 amplifies the downlink signal received from the antenna 61 by a low noise amplifier (not shown). The radio processing unit 62 multiplies the amplified downlink signal by a periodic signal having an intermediate frequency, thereby converting the frequency of the downlink signal from a radio frequency to a baseband frequency. The radio processing unit 62 performs analog-to-digital conversion on the downlink signal having the baseband frequency, and then transfers the converted signal to the control unit 64.
The storage section 63 includes, for example, a rewritable nonvolatile semiconductor memory or a volatile semiconductor memory. The storage unit 63 stores various information for communicating with the base station 41, various information transmitted or received by the mobile station 42, various programs to be operated by the mobile station 42, and the like. The storage unit 63 stores various information used for performing retransmission control. When applying retransmission control, the storage unit 63 stores the uplink signal that was transmitted for a certain period of time, in accordance with retransmission control, for example, HARQ, employed by the wireless communication system 2.
The control unit 64 includes, for example, 1 or more processors and peripheral circuits thereof. The control unit 64 modulates and multiplexes the uplink signal in accordance with the modulation and multiplexing scheme adopted in the communication standard that the wireless communication system 2 conforms to. Then, the control unit 64 transfers the modulated and multiplexed uplink signal to the radio processing unit 62. For example, the control unit 64 modulates and multiplexes the uplink signal in a multiplexing method according to SC-FDMA or other FDMA method.
On the other hand, the control unit 64 separates the downlink signal received from the radio processing unit 62 in accordance with the modulation and multiplexing scheme adopted in the communication standard which the radio communication system 2 conforms to, and demodulates the separated received signals. For example, the control unit 64 separates and demodulates the downlink signal in accordance with OFDMA. The control unit 64 extracts various kinds of control information and data included in the demodulated received signal. The control unit 64 executes processing corresponding to the extracted control information or data. For example, when the downlink signal includes an audio signal, the control unit 64 reproduces the audio signal through a speaker. When the downlink signal includes a video signal, the control unit 64 reproduces the video signal through the touch panel.
The control unit 64 executes various processes for performing wireless communication with the base station 41, such as a connection request process.
The control unit 64 executes various processes for performing retransmission control. The control unit 64 generates an uplink signal including information used for determining whether or not to apply retransmission control, such as CQI, the moving speed of the mobile station 42, and the current position of the mobile station 42, at a predetermined cycle or at a predetermined timing, for example. The predetermined timing may be, for example, at the time of handover or at the time of connection request. Then, the control unit 64 transmits the uplink signal to the base station 41 via the radio processing unit 62 and the antenna 61.
Further, each time a control signal including information indicating whether or not retransmission control is applicable is received from the base station 41, the control unit 64 controls the application of retransmission control with reference to the information. For example, the control unit 64 may control the application of retransmission control in accordance with, for example, an operation flowchart shown in fig. 7, as in the communication device 12 according to embodiment 2.
That is, if the received control signal includes information indicating that retransmission control is to be applied, the control section 64 applies retransmission control. In this case, the control unit 64 assigns an error detection code associated with retransmission control to the uplink signal. The control section 64 may use, for example, a CRC symbol as the error detection code. Before being notified of a signal (for example, an Ack signal) indicating that data transmitted from the base station 41 has been normally reproduced or before a certain period of time has elapsed, the control unit 64 stores the transmitted uplink signal in the storage unit 63 and retransmits the uplink signal. When receiving a signal requesting retransmission (for example, a Nack signal) from the base station 41, the control unit 64 generates a retransmission uplink signal including part or all of the data included in the uplink signal. The control unit 64 transmits the generated uplink signal to the base station 41 via the radio processing unit 62 and the antenna 61.
On the other hand, if the received control signal includes information indicating that retransmission control is not to be applied, the control section 64 does not apply retransmission control. In this case, the control unit 64 does not apply the error detection code associated with retransmission control to the data included in the uplink signal. In this case, the control unit 64 may discard the data included in the uplink signal transmitted to the base station 41 without storing the data in the storage unit 63.
Fig. 11(a) is a diagram showing an example of a structure of data transmitted by an uplink signal in a case where retransmission control is applied, and fig. 11(B) is a diagram showing an example of a structure of data transmitted by an uplink signal in a case where retransmission control is not applied.
As shown in fig. 11 a, a CRC symbol 1102 of a predetermined length (for example, a 24-bit length) is provided in the Physical (PHY) layer for each code block 1101 included in the uplink signal. Then, in the base station 41, whether or not each code block 1101 is reproduced normally is determined using the CRC symbol 1102. When retransmission control is applied, in a Medium Access Control (MAC) layer, a transport block 1103 and a CRC symbol 1104 having a predetermined length (for example, a 24-bit length) for retransmission control, for example, Ack/Nack determination of HARQ are obtained from 1 or more code blocks 1101. Then, whether or not the transport block 1103 is normally reproduced is determined based on the CRC symbol 1104. In addition, in a Radio Link Control (RLC) layer, an RLC Protocol Data Unit (RLC PDU)1105 is obtained from the transport block 1103. Also, the RLC PDU1105 is divided into a plurality of RLC SDUs 1106. Each RLC SDU1106 is transmitted from the base station 41 to the upper node apparatus in an IP packet format, for example.
On the other hand, as shown in fig. 11B, when retransmission control is not applied, in the physical layer, whether each code block 1111 is reproduced normally is determined using a CRC symbol 1112 of a predetermined length (for example, a 24-bit length) provided for each code block 1111. In the MAC layer, a transport block 1113 is obtained from 1 or more code blocks 1111. However, when retransmission control is not applied, the transport block 1113 is not given a CRC symbol for retransmission control. And, in the RLC layer, the RLC PDU1115 is obtained from the transport block 1113. Also, RLC PDU1115 is divided into a plurality of RLC SDUs 1116. Each RLC SDU1116 is transmitted from the base station 41 to the upper node apparatus, for example, in an IP packet manner.
As another example, as shown in fig. 11(C), in a layer that performs processing related to retransmission control on data 1120 included in a signal transmitted by an uplink signal, whether or not to apply error detection code 1121 for retransmission control may be switched. That is, the error detection code 1121 may be given to the data 1120 in the case where retransmission control is applied, and the error detection code 1121 may be omitted in the case where retransmission control is not applied. The error detection code 1121 may be a CRC symbol, or may be another error detection code.
As described above, in the radio communication system according to embodiment 2, the base station determines whether or not retransmission control is applicable, and notifies the mobile station of the applicability or non-applicability. Then, the mobile station controls the application of retransmission control in accordance with the notification. Therefore, the wireless communication system can dynamically switch whether or not to apply retransmission control, and thus can suppress a decrease in communication efficiency associated with retransmission control when retransmission control is not required to be applied. As a result, the wireless communication system can improve communication efficiency.
In addition, according to the modification, the mobile station can determine whether or not to apply retransmission control, generate an uplink control signal including information indicating whether or not to apply the retransmission control, and transmit the uplink control signal to the base station. The base station may control the application of retransmission control based on information indicating whether retransmission control is applicable or not included in the control signal.
In this case, for example, the control unit 64 of the mobile station 42 shown in fig. 10 may execute the processing of each unit of the retransmission control unit 241, the notification unit 242, and the retransmission control execution unit 243 shown in fig. 4. In this case, the control unit 64 may determine whether or not to apply retransmission control, for example, according to the type of data transmitted from the base station 41 to the mobile station 42. For example, the control unit 64 may determine the type of data to be transmitted from the base station 41 to the mobile station 42 based on an application program or the like being executed by the control unit 64. When the data transmitted from the base station 41 to the mobile station 42 is data requiring real-time performance, such as streaming data or data for voice call, the control unit 64 may determine not to apply retransmission control. Note that, when the data transmitted from the base station 41 to the mobile station 42 is data transmitted at a fixed cycle, such as data of the Internet of Things (IoT), the control unit 64 may determine not to apply retransmission control. On the other hand, when the data transferred from the base station 41 to the mobile station 42 is data for which the mobile station 42 is required to normally reproduce, for example, a certain computer program, the control section 64 may determine to apply retransmission control.
The control unit 64 may generate an uplink control signal including information indicating whether or not retransmission control is applicable, and transmit the control signal to the base station 41 via the radio processing unit 62 and the antenna 61.
On the other hand, the control unit 55 of the base station 41 may control the application of retransmission control based on the uplink control signal received from the mobile station 42, similarly to the control unit 64 of the mobile station 42.
In addition, according to another modification, when retransmission control is not applied, the base station 41 or the mobile station 42 may apply an error detection code associated with retransmission control to data included in a downlink signal or an uplink signal. Alternatively, the base station 41 or the mobile station 42 may make the error detection code given to the data in the case of applying the retransmission control different from the error detection code given to the data in the case of applying the retransmission control. For example, the error correction capability of the error detection code (error correction symbol) given to the data when the retransmission control is not applied may be made larger than the error correction capability of the error detection code (error correction symbol) given to the data when the retransmission control is applied.
Further, according to another modification, one of the base station 41 and the mobile station 42 may transmit a control signal including information indicating whether or not the error detection code associated with retransmission control is applied to the other of the base station 41 and the mobile station 42. The control signal may be, for example, a signal transmitted through a PDCCH, a MAC CE signal, or an RRC signal, as in the above-described embodiment. The criterion for determining whether or not to apply the error detection code associated with retransmission control may be the same as the criterion for determining whether or not to apply retransmission control, for example. And, the base station 41 or the mobile station 42 that has received the control signal can control the application of the error detection code associated with retransmission control in accordance with the control signal. For example, when the control signal includes information indicating that the error detection code associated with retransmission control is not to be given, the base station 41 or the mobile station 42 that has received the control signal does not give the error detection code associated with retransmission control to the data included in the transmission signal. In this case, the mobile station 42 or the base station 41 that has received the transmission signal can perform retransmission control using an error detection code that is not associated with retransmission control, such as a CRC symbol assigned to a code block as shown in fig. 11 (a). On the other hand, when the control signal includes information indicating that the error detection code associated with retransmission control is assigned, the base station 41 or the mobile station 42 that has received the control signal assigns the error detection code associated with retransmission control to the data included in the transmission signal. Thus, the radio communication system can dynamically switch whether or not to assign an error detection code associated with retransmission control to the transmitted data. The wireless communication system can reduce the communication volume corresponding to the bit quantity of the error detection code without additionally providing the error detection code related to the retransmission control. As a result, the wireless communication system can improve communication efficiency.
The control signal may include information indicating whether or not the error detection code associated with retransmission control is applied, and information indicating whether or not retransmission control is suitable. Alternatively, one of the base station 41 and the mobile station 42 may transmit either one of a control signal including information indicating whether or not an error detection code associated with retransmission control is applied and a control signal including information indicating whether or not retransmission control is suitable to the other of the base station 41 and the mobile station 42.
Further, the above-described embodiments and modifications may be combined. For example, the communication device 11 according to embodiment 1 can be the base station 41 or the mobile station 42 according to embodiment 2 or the modification. Similarly, the communication device 12 according to embodiment 1 can be the base station 41 or the mobile station 42 according to embodiment 2 or the modification.
All examples and specific language recited above are intended to assist the reader in understanding the contribution of the inventor to the invention and the advancement of the art, and are to be construed as being without limitation to the structure of any examples, such specific examples and conditions referred to in this specification as representing the advantages and disadvantages of the invention, as expressed for the purpose of teaching. The embodiments of the present invention have been described in detail, and it should be understood that various changes, substitutions, and alterations can be made hereto without departing from the spirit and scope of the invention.
Description of the reference symbols
1. 2: wireless communication system, 11, 12: communication device, 41: base station, 42: mobile station, 21, 31, 51, 61: antenna, 22, 32, 52, 62: wireless processing unit, 23, 33, 54, 63: storage, 24, 34, 55, 64: control unit, 53: wired interface section, 241: retransmission control unit, 242: notification unit, 243: and a retransmission control execution unit.

Claims (8)

1. A communication device, the communication device having:
a wireless processing unit that transmits or receives a wireless signal; and
a control unit that controls application of retransmission control based on information indicating whether retransmission control is applied or not included in a radio signal received from another communication device by the radio processing unit,
the control unit controls whether or not to apply an error detection code to the data blocks in layer 1 and layer 2, depending on whether or not the retransmission control is applied,
when the retransmission control is not applied, the control unit assigns the error detection code to the data block of the layer 1 included in the radio signal transmitted to the other communication apparatus, but does not assign the error detection code to the data block of the layer 2.
2. The communication device of claim 1,
when the retransmission control is applied, the control unit assigns an error detection code associated with the retransmission control to data included in a radio signal transmitted to the other communication apparatus.
3. A wireless communication system having a 1 st communication device and a 2 nd communication device,
the 1 st communication device transmits a wireless signal containing information indicating whether or not retransmission control is applied to the 2 nd communication device,
the 2 nd communication device controls application of the retransmission control according to the information,
the 2 nd communication device controls whether or not to give an error detection code to the data blocks in the 1 st layer and the 2 nd layer depending on whether or not the retransmission control is applied,
when the retransmission control is not applied, the 2 nd communication device assigns the error detection code to the layer 1 data block included in the radio signal transmitted to the 1 st communication device, and does not assign the error detection code to the layer 2 data block.
4. The wireless communication system of claim 3,
when the retransmission control is applied, the 2 nd communication device assigns an error detection code associated with the retransmission control to data included in a radio signal transmitted to the 1 st communication device.
5. The wireless communication system of claim 3 or 4,
the 1 st communication device determines whether or not to apply the retransmission control based on at least one of a communication state of the wireless communication between the 1 st communication device and the 2 nd communication device, a communication amount, and a type of data transmitted between the 1 st communication device and the 2 nd communication device, and generates a wireless signal including information indicating whether or not to apply the retransmission control based on a result of the determination.
6. The wireless communication system of claim 3 or 4,
the 1 st communication device is a base station and the 2 nd communication device is a mobile station.
7. A wireless communication method of a wireless communication system having a 1 st communication device and a 2 nd communication device, the wireless communication method comprising the steps of:
the 1 st communication device transmits a wireless signal containing information indicating whether or not retransmission control is applied to the 2 nd communication device,
the 2 nd communication device controls whether to give an error detection code to the data blocks in the 1 st layer and the 2 nd layer according to the information,
when the retransmission control is not applied, the 2 nd communication device assigns the error detection code to the layer 1 data block included in the radio signal transmitted to the 1 st communication device, and does not assign the error detection code to the layer 2 data block.
8. A communication device, the communication device having:
a wireless processing unit that transmits or receives a wireless signal; and
a control unit that determines whether or not retransmission control is to be applied, based on at least one of a communication state and a communication amount of wireless communication with another communication device and a type of data transmitted between the communication device and the other communication device, generates a wireless signal including information indicating whether or not retransmission control is to be applied, based on a result of the determination, and transmits the wireless signal to the other communication device via the wireless processing unit,
the radio processing unit receives a radio signal transmitted from the other communication device and controlled as follows based on the information indicating whether or not the retransmission control is applied: assigning an error detection code to the layer 1 data block without applying the retransmission control; and not assigning the error detection code to the data block of layer 2.
CN201680085501.1A 2016-05-13 2016-05-13 Communication device, wireless communication system, and wireless communication method Active CN109155934B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2016/064368 WO2017195366A1 (en) 2016-05-13 2016-05-13 Communication device, wireless communication system, and wireless communication method

Publications (2)

Publication Number Publication Date
CN109155934A CN109155934A (en) 2019-01-04
CN109155934B true CN109155934B (en) 2022-02-25

Family

ID=60266427

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201680085501.1A Active CN109155934B (en) 2016-05-13 2016-05-13 Communication device, wireless communication system, and wireless communication method

Country Status (5)

Country Link
US (2) US11082160B2 (en)
EP (1) EP3457738A4 (en)
JP (1) JP6741065B2 (en)
CN (1) CN109155934B (en)
WO (1) WO2017195366A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7027706B2 (en) * 2017-06-15 2022-03-02 ソニーグループ株式会社 Transmitter, receiver, transmission method, reception method and recording medium
WO2022056874A1 (en) * 2020-09-18 2022-03-24 华为技术有限公司 Data transmission method, communication device, and storage medium

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101232443A (en) * 2007-01-26 2008-07-30 索尼株式会社 Transmitting device, receiving device, packet transmission method, packet reception method, and programs for same
CN101938342A (en) * 2009-07-01 2011-01-05 中兴通讯股份有限公司 Data transmission method and device based on hybrid automatic retransmission request
CN102567276A (en) * 2011-12-19 2012-07-11 华为技术有限公司 Data transmission method based on multiple channels, related nodes and system
CN104284135A (en) * 2013-07-02 2015-01-14 华为技术有限公司 Video transmission method and device
WO2016068072A1 (en) * 2014-10-31 2016-05-06 三菱電機株式会社 Communication system

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3757857B2 (en) * 2001-12-12 2006-03-22 ソニー株式会社 Data communication system, data transmission apparatus, data reception apparatus and method, and computer program
JP2006520121A (en) * 2003-03-17 2006-08-31 サムスン エレクトロニクス カンパニー リミテッド Power control method and apparatus using control information in mobile communication system
JP2005045409A (en) 2003-07-24 2005-02-17 Pioneer Electronic Corp Information processor, its system, its method, and its program, and recording medium with the program recorded
JP2006121394A (en) * 2004-10-21 2006-05-11 Matsushita Electric Ind Co Ltd Apparatus and system for radio communication
US8169995B2 (en) * 2006-12-04 2012-05-01 Samsung Electronics Co., Ltd. System and method for wireless communication of uncompressed video having delay-insensitive data transfer
KR101394784B1 (en) * 2007-10-16 2014-05-15 엘지전자 주식회사 Method of Performing ARQ Procedure for Transmitting High Rate Data
US8238958B2 (en) * 2008-04-11 2012-08-07 Wi-Lan Inc. Method, apparatus, and system for uplink modulation and coding scheme selection
US8634384B2 (en) * 2008-04-11 2014-01-21 Wi-Lan Inc. Efficient determination of a link performance parameter
JP5169449B2 (en) * 2008-05-01 2013-03-27 富士通株式会社 Wireless communication apparatus and reception method
JP5709529B2 (en) 2009-01-30 2015-04-30 パナソニック インテレクチュアル プロパティ コーポレーション オブアメリカＰａｎａｓｏｎｉｃ Ｉｎｔｅｌｌｅｃｔｕａｌ Ｐｒｏｐｅｒｔｙ Ｃｏｒｐｏｒａｔｉｏｎ ｏｆ Ａｍｅｒｉｃａ Wireless receiver
CN103973397B (en) * 2013-01-29 2019-01-08 中兴通讯股份有限公司 Sending and receiving method, base station and the terminal of ACK/NACK information
KR101799715B1 (en) 2013-12-20 2017-11-20 텔레호낙티에볼라게트 엘엠 에릭슨(피유비엘) High-reliability transmission scheme with low resource utilization
US10103849B2 (en) * 2015-08-13 2018-10-16 Lg Electronics Inc. Method of transmitting or receiving uplink control information in wireless communication system and apparatus for the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101232443A (en) * 2007-01-26 2008-07-30 索尼株式会社 Transmitting device, receiving device, packet transmission method, packet reception method, and programs for same
CN101938342A (en) * 2009-07-01 2011-01-05 中兴通讯股份有限公司 Data transmission method and device based on hybrid automatic retransmission request
CN102567276A (en) * 2011-12-19 2012-07-11 华为技术有限公司 Data transmission method based on multiple channels, related nodes and system
CN104284135A (en) * 2013-07-02 2015-01-14 华为技术有限公司 Video transmission method and device
WO2016068072A1 (en) * 2014-10-31 2016-05-06 三菱電機株式会社 Communication system

Also Published As

Publication number Publication date
US11082160B2 (en) 2021-08-03
US20190074933A1 (en) 2019-03-07
EP3457738A1 (en) 2019-03-20
US20210226733A1 (en) 2021-07-22
WO2017195366A1 (en) 2017-11-16
JP6741065B2 (en) 2020-08-19
JPWO2017195366A1 (en) 2019-02-07
EP3457738A4 (en) 2019-04-24
CN109155934A (en) 2019-01-04

Similar Documents

Publication Publication Date Title
US11750337B2 (en) Retransmission protocol feedback handling with multiple feedback times
CN107005509B (en) Method, apparatus and system for data transmission in an unlicensed shared medium
CN110168988B (en) Advanced decoding method and apparatus for data and control retransmission
CN109314674B (en) Delaying transmission depending on transmission type and UE processing capability
WO2013137925A1 (en) Uplink control channel resource collision avoidance in carrier aggregation systems
US20190173623A1 (en) Reallocation of control channel resources for retransmission of data in wireless networks based on communications mode
CN110214432B (en) Method and node for activation or deactivation of a carrier in a communication network
JP2019514279A (en) Wireless network node, wireless device and method implemented in them
CN110692211A (en) Base station device, terminal device, wireless communication system, and communication method
WO2020224969A1 (en) Communications device, infrastructure equipment and methods
EP3651391A1 (en) Terminal device, base station device, and communication method
CN108886754B (en) Method for indicating transmission time offset of feedback message
CN108463986B (en) Wireless communication device, wireless communication system, and wireless communication method
CN108463987B (en) Wireless communication device, wireless communication system, and wireless communication method
US20210226733A1 (en) Communication apparatus, wireless communication system, and wireless communication method
CN114073161B (en) Terminal, base station, communication method and integrated circuit
US11463907B2 (en) Base station equipment, communication terminal, communication system, program, frame transmitting method, and data structure
CN112237027B (en) Electronic device, method and storage medium for wireless communication system
JP2020123983A (en) Communication apparatus, radio communication system, and radio communication method
JP7277539B2 (en) Devices that handle HARQ retransmissions
US9402267B2 (en) Radio base station and communication control method
KR20100005672A (en) Device and method for transmitting data

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant